A self-centering device for vertical lathe worktable

Abstract

The invention relates to a self-centering device for a vertical lathe workbench, belonging to the technical field of self-centering of workbench; the device comprises a clamping mechanism and a measuring mechanism, the clamping mechanism comprises a rotatable workbench, an inner clamping assembly and an outer clamping assembly are arranged on the workbench, the inner clamping assembly comprises a circle of inner clamping jaws sliding radially along the workbench, and the outer clamping assembly comprises a circle of outer clamping jaws sliding radially along the workbench; the measuring mechanism comprises a measuring frame, the measuring frame is located at one side of the workbench, a liftable bracket and a driving frame are slidingly arranged on the measuring frame through a lifting assembly, a sliding frame is slidingly arranged at the lower end of the bracket along the radial direction of the workbench, a contact is arranged at one end of the sliding frame facing the workbench, a driving assembly is arranged on the driving frame, and the sliding frame is controlled to slide on the bracket through the driving assembly; the problem of large error and low efficiency caused by manual measurement when the vertical lathe and flange blank are currently processed is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of workbench self-centering, and in particular relates to a self-centering device for a vertical lathe workbench. Background Art

[0002] At present, vertical lathes are generally used in the market to process wind turbine flanges. Since there are only ordinary claws on the workbench of the vertical lathe to clamp the wind turbine flange, the wind turbine flange blank can only be processed by manual measurement before it can be clamped or released. Since manual measurement will inevitably result in measurement errors, the processing quality of the wind turbine flange will not meet the standards. At the same time, manual measurement is time-consuming and labor-intensive, which will greatly affect the processing efficiency of the wind turbine flange. Summary of the invention

[0003] The invention overcomes the shortcomings of the prior art and provides a self-centering device for a vertical lathe worktable; it solves the problems of large errors and low efficiency caused by manual measurement when the vertical lathe and flange blank are processed.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0005] A self-centering device for a vertical lathe worktable comprises a clamping mechanism and a measuring mechanism, wherein the clamping mechanism comprises a rotatable circular worktable, on which an inner clamping assembly and an outer clamping assembly are arranged, wherein the inner clamping assembly comprises a circle of inner clamping jaws which slide radially along the worktable, and the outer clamping assembly comprises a circle of outer clamping jaws which slide radially along the worktable; the measuring mechanism comprises a measuring frame, which is located at one side of the worktable, on which a liftable bracket and a driving frame are slidably arranged via a lifting assembly, a sliding frame is arranged at the lower end of the bracket so as to slide radially along the worktable, a contact is arranged at one end of the sliding frame facing the worktable, and a driving assembly is arranged on the driving frame, and the sliding frame is controlled to slide on the bracket via the driving assembly.

[0006] Furthermore, four circular array guide rail seats are fixedly arranged on the upper end surface of the workbench, and the length direction of the guide rail seat is arranged along the radial direction of the workbench; each guide rail seat includes two symmetrically arranged radial guide rails, and the length direction of the radial guide rails is parallel to the length direction of the guide rail seat; a motor seat is fixedly arranged at one end of each guide rail seat away from the axis of the workbench.

[0007] Furthermore, the inner clamping assembly also includes an inner sliding seat, an inner clamping screw, and an inner clamping motor; the same inner sliding seat is slidably arranged on the two radial guide rails of each guide rail seat, and an inner clamping claw is fixedly arranged on the upper end surface of each inner sliding seat; an inner clamping screw is rotatably arranged inside each guide rail seat, and the inner clamping screw is threadedly connected to the inner sliding seat; an inner clamping motor is fixedly arranged on each motor seat, and the output shaft of the inner clamping motor is connected to the outer end of the corresponding inner clamping screw.

[0008] Furthermore, the outer clamping assembly also includes an outer sliding seat, an outer clamping screw, and an outer clamping motor; the same outer sliding seat is slidably arranged on the two radial guide rails of each guide rail seat, and the outer sliding seat is located on the side of the inner sliding seat away from the workbench axis; an outer clamping claw is fixedly arranged on the upper end surface of each outer sliding seat; an outer clamping screw is rotatably arranged on the inner side of each guide rail seat, and the outer clamping screw is screwed to the outer sliding seat; an outer clamping motor is fixedly arranged on each motor seat, and the output shaft of the outer clamping motor is connected to the outer end of the corresponding outer clamping screw.

[0009] Furthermore, the bracket and the driving frame are both arranged on the same side of the measuring frame, wherein the lower end surface of the bracket is kept horizontal, and the driving frame is arranged horizontally along the radial direction of the workbench.

[0010] Furthermore, the lifting assembly includes a lifting motor, a synchronous belt transmission mechanism, and a transmission shaft; a lifting motor is fixedly arranged on the upper end surface of the measuring frame, and a transmission shaft is also rotatably arranged on the upper end surface of the measuring frame, and the transmission shaft is arranged along the radial direction of the workbench, and the output shaft of the lifting motor and the transmission shaft are connected by a synchronous belt transmission mechanism.

[0011] Furthermore, the lifting assembly also includes a lifting guide rail, a lifting slider, a lifting synchronous belt, a driving pulley, and a driven pulley; four vertical lifting guide rails are fixedly arranged on the side of the measuring frame close to the bracket; two lifting sliders are fixedly arranged on the side of the bracket close to the measuring bracket, and two lifting sliders are fixedly arranged on the side of the driving frame close to the measuring frame, and the two lifting sliders on the bracket are respectively slidably engaged with the outer sides of the two lifting guide rails close to the workbench side, and the two lifting sliders on the driving frame are respectively slidably engaged with the outer sides of the two lifting guide rails away from the workbench side; four driving pulleys are fixedly sleeved on the transmission shaft, and four driven pulleys are rotatably arranged at the lower end of the side of the measuring frame close to the bracket, and the driving pulleys and the driven pulleys correspond one to one up and down; the four lifting synchronous belts are respectively sleeved on the outer sides of the four groups of driving pulleys and the driven pulleys, wherein the bracket is fixedly arranged on the two lifting synchronous belts close to the workbench side, and the driving frame is fixedly arranged on the two lifting synchronous belts away from the workbench side.

[0012] Furthermore, the sliding frame is a horizontally arranged square frame structure, and the length direction of the sliding frame is arranged along the radial direction of the workbench; two symmetrical longitudinal guide rails are fixedly arranged on the upper end surface of the sliding frame, and the two longitudinal guide rails are parallel to the length direction of the sliding frame; two longitudinal sliders are fixedly arranged on the lower end surface of the bracket, and the two longitudinal sliders are respectively slidably engaged with the outer sides of the two longitudinal guide rails, so that the sliding frame is slidably arranged at the lower end of the bracket.

[0013] Furthermore, the driving assembly includes a driving motor, a driving screw, a driving seat, a connecting plate, and a spring; a driving motor is fixedly arranged at one end of the driving frame away from the workbench, a driving screw is rotatably arranged at the lower end of the driving frame, the driving screw is arranged along the radial direction of the workbench, the output shaft of the driving motor is fixedly connected to the end of the driving screw, a driving seat is screwed on the outer side of the driving screw, the upper end surface of the driving seat maintains sliding contact with the lower end surface of the driving frame, two connecting plates are fixedly arranged at one end of the sliding frame away from the workbench, the two connecting plates are arranged along the radial direction of the workbench, and the two connecting plates are respectively located on both sides of the driving seat; a spring is respectively arranged between the driving seat and the two connecting plates, the spring is extended along the radial direction of the workbench, and the two ends of the spring are respectively hooked with the driving seat and the connecting plate.

[0014] Furthermore, a grating scale is fixedly arranged on the side of the sliding frame away from the measuring frame, and the length direction of the grating scale is consistent with that of the sliding frame; a grating scale reader is fixedly arranged on the lower end of the side of the driving frame close to the workbench, and the grating scale reader corresponds to the grating scale up and down.

[0015] The beneficial effects of the present invention compared with the prior art are as follows:

[0016] A self-centering device for a vertical lathe worktable provided by the present invention can automatically measure the outer side surface of a flange blank and calculate the axis of the outer side surface of the flange blank, and adjust the flange blank on the worktable according to the calculated axis, and stably clamp the outer side surface and inner side surface of the adjusted flange blank, which can not only ensure that the processing quality of the flange blank meets the requirements, but also ensure that the processing efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a three-dimensional schematic diagram of the present invention as a whole;

[0019] Figure 2 is a top view of the present invention as a whole;

[0020] Figure 3 It is a front view of the present invention as a whole;

[0021] Figure 4 yes Figure 1 Structural diagram of the clamping mechanism;

[0022] Figure 5 yes Figure 1 Schematic diagram of the structure of the measuring mechanism;

[0023] Figure 6 yes Figure 5 A local enlarged schematic diagram of the middle A;

[0024] Figure 7 yes Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0025] Among them, 1 is a workbench, 2 is an inner clamp, 3 is an outer clamp, 4 is a guide seat, 5 is a motor seat, 6 is an inner sliding seat, 7 is an inner clamping screw, 8 is an inner clamping motor, 9 is an outer sliding seat, 10 is an outer clamping screw, 11 is an outer clamping motor, 12 is a measuring frame, 13 is a foot cup, 14 is a bracket, 15 is a drive frame, 16 is a lifting motor, 17 is a transmission shaft, 18 is a synchronous belt transmission mechanism, 19 is a lifting guide rail, 20 is a lifting slider, 21 is a driving pulley, 22 is a driven pulley, 23 is a lifting synchronous belt, 24 is a sliding frame, 25 is a longitudinal guide rail, 26 is a longitudinal slider, 27 is a transverse guide rail, 28 is a connecting seat, 29 is a mounting shaft, 30 is a contact, 31 is a driving motor, 32 is a driving screw, 33 is a driving seat, 34 is a connecting plate, 35 is a spring, 36 is a grating ruler, and 37 is a grating ruler reader. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0027] like Figure 1As shown in FIG. 7 , the present invention provides a self-centering device for a vertical lathe worktable, including a clamping mechanism and a measuring mechanism, wherein the clamping mechanism includes a rotatable circular worktable 1, on which an inner clamping assembly and an outer clamping assembly are arranged, wherein the inner clamping assembly includes a circle of inner clamping jaws 2 which slide radially along the worktable 1, and the outer clamping assembly includes a circle of outer clamping jaws 3 which slide radially along the worktable 1; the measuring mechanism includes a measuring frame 12, which is located on one side of the worktable 1, and on which a liftable bracket 14 and a driving frame 15 are slidably arranged through a lifting assembly, and a sliding frame 24 is arranged at the lower end of the bracket 14 so as to slide radially along the worktable 1, and a contact 30 is arranged on the end of the sliding frame 24 which faces the worktable 1, and a driving assembly is arranged on the driving frame 15, and the sliding frame 24 is controlled to slide on the bracket 14 through the driving assembly.

[0028] The workbench 1 is a circular plate-shaped structure arranged horizontally.

[0029] Four circular array guide rail seats 4 are fixedly arranged on the upper end surface of the workbench 1, and the length direction of the guide rail seats 4 is arranged along the radial direction of the workbench 1; each guide rail seat 4 includes two symmetrically arranged radial guide rails, and the length direction of the radial guide rails is parallel to the length direction of the guide rail seat 4. A motor seat 5 is fixedly arranged at one end of each guide rail seat 4 away from the axis of the workbench 1.

[0030] The inner clamping assembly further includes an inner sliding seat 6 , an inner clamping screw rod 7 , and an inner clamping motor 8 .

[0031] The same inner sliding seat 6 is slidably arranged on the two radial guide rails of each guide rail seat 4, and an inner clamping claw 2 is fixedly arranged on the upper end surface of each inner sliding seat 6. An inner clamping screw 7 is rotatably arranged inside each guide rail seat 4, and the inner clamping screw 7 is screwed to the inner sliding seat 6; the axis of the inner clamping screw 7 is parallel to the length direction of the guide rail seat 4, and the outer end of the inner clamping screw 7 extends to the motor seat 5. An inner clamping motor 8 is fixedly arranged on each motor seat 5, and the output shaft of the inner clamping motor 8 is connected to the outer end of the corresponding inner clamping screw 7 through a pair of mutually meshing bevel gears.

[0032] The inner clamping motor 8 drives the inner clamping screw 7 to rotate through a pair of bevel gears. Since the inner clamping screw 7 is threadedly connected to the inner sliding seat 6, the inner sliding seat 6 is driven to slide on the guide rail seat 4 along the radial direction of the workbench 1, and the inner sliding seat 6 drives the inner clamping jaw 2 to slide along the radial direction of the workbench 1.

[0033] The outer clamping assembly further includes an outer sliding seat 9 , an outer clamping screw rod 10 , and an outer clamping motor 11 .

[0034] The same outer sliding seat 9 is slidably arranged on the two radial guide rails of each guide rail seat 4, and the outer sliding seat 9 is located on the side of the inner sliding seat 6 away from the axis of the workbench 1. An outer clamping claw 3 is fixedly arranged on the upper end surface of each outer sliding seat 9. An outer clamping screw 10 is rotatably arranged on the inner side of each guide rail seat 4, and the outer clamping screw 10 is screwed to the outer sliding seat 9; the axis of the outer clamping screw 10 is parallel to the length direction of the guide rail seat 4, and the outer end of the outer clamping screw 10 extends to the motor seat 5. An outer clamping motor 11 is fixedly arranged on each motor seat 5, and the output shaft of the outer clamping motor 11 is connected to the outer end of the corresponding outer clamping screw 10 through a pair of mutually meshing bevel gears.

[0035] The outer clamping motor 11 drives the outer clamping screw 10 to rotate through a pair of bevel gears. Since the outer clamping screw 10 is threadedly connected to the outer sliding seat 9, the outer sliding seat 9 is driven to slide on the guide rail seat 4 along the radial direction of the workbench 1, and the outer sliding seat 9 drives the outer clamping claw 3 to slide along the radial direction of the workbench 1.

[0036] The measuring frame 12 is a square frame structure, and the length direction of the measuring frame 12 is arranged along the radial direction of the workbench 1. An adjustable foot cup 13 is respectively arranged at the four corners of the lower end surface of the measuring frame 12.

[0037] The bracket 14 and the driving frame 15 are both arranged on the same side of the measuring frame 12 , wherein the lower end surface of the bracket 14 is kept horizontal, and the driving frame 15 is arranged horizontally along the radial direction of the workbench 1 .

[0038] The lifting assembly includes a lifting motor 16 , a synchronous belt transmission mechanism 18 , a transmission shaft 17 , a lifting guide rail 19 , a lifting slider 20 , a lifting synchronous belt 23 , a driving pulley 21 , and a driven pulley 22 .

[0039] A lifting motor 16 is fixedly arranged on the upper end surface of the measuring frame 12, and a transmission shaft 17 is also rotatably arranged on the upper end surface of the measuring frame 12. The transmission shaft 17 is arranged along the radial direction of the workbench 1, and the output shaft of the lifting motor 16 is parallel to the transmission shaft 17. The output shaft of the lifting motor 16 is connected to the transmission shaft 17 through a synchronous belt transmission mechanism 18.

[0040] Four vertical lifting rails 19 are fixedly arranged on the side of the measuring frame 12 close to the bracket 14. Two lifting slide blocks 20 are fixedly arranged on the side of the bracket 14 close to the measuring bracket 14, and two lifting slide blocks 20 are fixedly arranged on the side of the driving frame 15 close to the measuring frame 12. The two lifting slide blocks 20 on the bracket 14 are respectively slidably engaged with the outer sides of the two lifting rails 19 close to the side of the workbench 1, and the two lifting slide blocks 20 on the driving frame 15 are respectively slidably engaged with the outer sides of the two lifting rails 19 away from the side of the workbench 1.

[0041] Four driving pulleys 21 are fixedly sleeved on the transmission shaft 17, and four driven pulleys 22 are rotatably arranged at the lower end of the measuring frame 12 near the bracket 14, and the driving pulleys 21 correspond to the driven pulleys 22 one by one. Four lifting synchronous belts 23 are respectively sleeved on the outer sides of the four sets of driving pulleys 21 and the driven pulleys 22, wherein the bracket 14 is fixedly arranged on the two lifting synchronous belts 23 near the side of the workbench 1, and the driving frame 15 is fixedly arranged on the two lifting synchronous belts 23 away from the side of the workbench 1.

[0042] The lifting motor 16 drives the transmission shaft 17 to rotate through the synchronous belt transmission mechanism 18, and the transmission shaft 17 drives all the driving pulleys 21 to rotate. The driving pulley 21 drives the lifting synchronous belt 23 to rotate with the cooperation of the driven pulley 22. The four lifting synchronous belts 23 drive the bracket 14 and the driving frame 15 to lift and lower. With the cooperation of the lifting slider 20 and the lifting guide rail 19, it is ensured that the bracket 14 and the driving frame 15 can be lifted and lowered stably.

[0043] The sliding frame 24 is a horizontally arranged square frame structure, and the length direction of the sliding frame 24 is arranged along the radial direction of the workbench 1. Two symmetrical longitudinal guide rails 25 are fixedly arranged on the upper end surface of the sliding frame 24, and the two longitudinal guide rails 25 are parallel to the length direction of the sliding frame 24. Two longitudinal sliders 26 are fixedly arranged on the lower end surface of the bracket 14, and the two longitudinal sliders 26 are respectively slidably engaged with the outer sides of the two longitudinal guide rails 25, so that the sliding frame 24 is slidably arranged at the lower end of the bracket 14.

[0044] A horizontal transverse guide rail 27 is fixedly arranged at one end of the sliding frame 24 close to the workbench 1, and the transverse guide rail 27 is kept perpendicular to the longitudinal guide rail 25. A transverse slider is slidably clamped on the transverse guide rail 27, and a connecting seat 28 is fixedly arranged on the transverse slider. A vertical mounting shaft 29 is rotatably arranged inside the connecting seat 28, and the contact 30 is fixedly sleeved on the mounting shaft 29. A locking screw is threaded on the connecting seat 28, and the tip of the locking screw faces one side of the transverse guide rail 27. When the locking screw is tightened, the tip of the locking screw is tightly pressed on the transverse guide rail 27, so that the connecting seat 28 is locked and the position of the contact 30 is fixed; when the locking screw is loosened, the tip of the locking screw is separated from the transverse guide rail 27, so that the connecting seat 28 can slide on the transverse guide rail 27, thereby adjusting the position of the contact 30 laterally.

[0045] The driving assembly includes a driving motor 31 , a driving screw rod 32 , a driving seat 33 , a connecting plate 34 , and a spring 35 .

[0046] A driving motor 31 is fixedly arranged at one end of the driving frame 15 away from the workbench 1, and a driving screw 32 is rotatably arranged at the lower end of the driving frame 15. The driving screw 32 is arranged along the radial direction of the workbench 1, and the output shaft of the driving motor 31 is fixedly connected to the end of the driving screw 32, and the driving motor 31 drives the driving screw 32 to rotate. A driving seat 33 is screwed to the outer side of the driving screw 32, and the upper end surface of the driving seat 33 maintains sliding contact with the lower end surface of the driving frame 15. When the driving screw 32 rotates, it drives the driving seat 33 to slide along the radial direction of the workbench 1.

[0047] Two connecting plates 34 are fixedly arranged at one end of the sliding frame 24 away from the workbench 1. The two connecting plates 34 are arranged along the radial direction of the workbench 1, and the two connecting plates 34 are respectively located on both sides of the driving seat 33. A spring 35 is respectively arranged between the driving seat 33 and the two connecting plates 34. The spring 35 is a cylindrical helical compression spring. The spring 35 is extended along the radial direction of the workbench 1, and the two ends of the spring 35 are hooked with the driving seat 33 and the connecting plate 34 respectively.

[0048] A grating ruler 36 is fixedly arranged on the side of the slide frame 24 away from the measuring frame 12, and the length direction of the grating ruler 36 is consistent with that of the slide frame 24. A grating ruler reader 37 is fixedly arranged on the lower end of the side of the driving frame 15 close to the workbench 1, and the grating ruler reader 37 corresponds to the grating ruler 36 up and down.

[0049] The present invention provides a method for using a self-centering device for a vertical lathe worktable, comprising the following steps:

[0050] In the first step, the flange blank is placed at the center of the upper end surface of the workbench 1, and the four outer clamping motors 11 are controlled to operate, thereby driving the four outer clamping jaws 3 to slide toward one side of the axis of the workbench 1 until the four outer clamping jaws 3 clamp the outer side surface of the flange blank.

[0051] The second step is to control the workbench 1 to start rotating, and the workbench 1 drives the flange blank to rotate horizontally through the outer clamping assembly.

[0052] The third step is to control the lifting motor 16 to start rotating. The lifting motor 16 drives the transmission shaft 17 to rotate through the synchronous belt transmission mechanism 18. The transmission shaft 17 drives all the active pulleys 21 to rotate. The active pulley 21 drives the lifting synchronous belt 23 to rotate with the cooperation of the driven pulley 22. The four lifting synchronous belts 23 drive the bracket 14 and the driving frame 15 to lift and lower. When the bracket 14 is lifted and lowered, it drives the sliding frame 24 to lift and lower synchronously. The contact 30 on the sliding frame 24 also lifts and lowers synchronously, so that the contact 30 is adapted to the detection height of the outer side surface of the flange blank.

[0053] The fourth step is to loosen the locking screw, control the contact 30 to slide horizontally, so that the contact 30 corresponds to the axis of the flange, and then tighten the locking screw to fix the contact 30.

[0054] The fifth step is to control the driving motor 31 to start rotating. The driving motor 31 drives the driving screw 32 to rotate. The driving screw 32 drives the driving seat 33 to slide toward the direction close to the workbench 1. The driving seat 33 starts to compress the spring 35 close to the side of the workbench 1. The driving seat 33 drives the sliding frame 24 to slide toward the side of the workbench 1 through the spring 35 close to the side of the workbench 1 until the contact 30 contacts the outer side of the flange blank.

[0055] Step 6: After the contact 30 contacts the outer side of the flange blank, as the flange blank rotates continuously, the flange blank drives the contact 30 to slide back and forth along the workbench 1, and the contact 30 drives the sliding frame 24 to slide back and forth synchronously, and the sliding frame 24 continuously compresses the spring 35 back and forth. During the reciprocating sliding of the sliding frame 24, the grating scale 36 on the sliding frame 24 also slides back and forth relative to the grating scale reader 37, and the grating scale reader 37 measures the runout size of the grating scale 36 and sends the runout size to the PLC for processing, which becomes readable data, thereby automatically finding the corresponding center of the outer side of the flange blank. Then, the four outer clamping motors 11 are controlled to act separately, so that the four outer clamping jaws 3 slide and adjust respectively, and the outer clamping jaws 3 drive the flange blank to slide on the workbench 1 until the center of the outer side of the flange blank corresponds to the axis of the workbench 1, and the four outer clamping jaws 3 clamp the outer side of the flange blank.

[0056] In the seventh step, the vertical lathe starts to process the inner side and top surface of the flange blank.

[0057] Step 8: Control the four outer clamping motors 11 to move synchronously, so that the four outer clamping jaws 3 are away from the flange blank, thereby loosening the flange blank. Simultaneously, control the four inner clamping motors 8 to move synchronously, so that the four inner clamping jaws 2 clamp the inner side of the flange blank.

[0058] In the ninth step, the vertical lathe starts to process the outer side and bottom surface of the flange blank.

[0059] In the tenth step, the flange blank is processed.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A self-centering device for a vertical lathe worktable, characterized in that: The invention comprises a clamping mechanism and a measuring mechanism, wherein the clamping mechanism comprises a rotatable circular worktable (1), an inner clamping assembly and an outer clamping assembly are arranged on the worktable (1), the inner clamping assembly comprises a circle of inner clamping jaws (2) which slide radially along the worktable (1), and the outer clamping assembly comprises a circle of outer clamping jaws (3) which slide radially along the worktable (1); the measuring mechanism comprises a measuring frame (12), the measuring frame (12) is located on one side of the worktable (1), a liftable bracket (14) and a driving frame (15) are slidably arranged on the measuring frame (12) via a lifting assembly, a sliding frame (24) is arranged at the lower end of the bracket (14) which slides radially along the worktable (1), a contact (30) is arranged at one end of the sliding frame (24) which faces the worktable (1), and a driving assembly is arranged on the driving frame (15), and the sliding frame (24) is controlled by the driving assembly to slide on the bracket (14); The support (14) and the driving frame (15) are both arranged on the same side of the measuring frame (12), wherein the lower end surface of the support (14) is kept horizontal, and the driving frame (15) is arranged horizontally along the radial direction of the workbench (1); The sliding frame (24) is a horizontally arranged square frame structure, and the length direction of the sliding frame (24) is arranged along the radial direction of the workbench (1); two symmetrical longitudinal guide rails (25) are fixedly arranged on the upper end surface of the sliding frame (24), and the two longitudinal guide rails (25) are parallel to the length direction of the sliding frame (24); two longitudinal sliders (26) are fixedly arranged on the lower end surface of the bracket (14), and the two longitudinal sliders (26) are respectively slidably engaged with the outer sides of the two longitudinal guide rails (25), so that the sliding frame (24) is slidably arranged at the lower end of the bracket (14); The driving assembly comprises a driving motor (31), a driving screw (32), a driving seat (33), a connecting plate (34), and a spring (35); the driving motor (31) is fixedly arranged at one end of the driving frame (15) away from the workbench (1); a driving screw (32) is rotatably arranged at the lower end of the driving frame (15); the driving screw (32) is arranged along the radial direction of the workbench (1); the output shaft of the driving motor (31) is fixedly connected to the end of the driving screw (32); a driving seat (33) is screwed on the outer side of the driving screw (32); the driving seat (33) is The upper end surface is in sliding contact with the lower end surface of the driving frame (15); two connecting plates (34) are fixedly arranged at one end of the sliding frame (24) away from the workbench (1); the two connecting plates (34) are arranged along the radial direction of the workbench (1), and the two connecting plates (34) are respectively located on both sides of the driving seat (33); a spring (35) is respectively arranged between the driving seat (33) and the two connecting plates (34); the spring (35) is extended along the radial direction of the workbench (1), and the two ends of the spring (35) are respectively hooked with the driving seat (33) and the connecting plate (34); A horizontal transverse guide rail (27) is fixedly arranged at one end of the sliding frame (24) close to the workbench (1), and the transverse guide rail (27) is kept perpendicular to the longitudinal guide rail (25); a transverse slider is slidably engaged with the transverse guide rail (27), and a connecting seat (28) is fixedly arranged on the transverse slider, and a vertical mounting shaft (29) is rotatably arranged inside the connecting seat (28), and the contact (30) is fixedly sleeved on the mounting shaft (29); a locking screw is threaded on the connecting seat (28), and the tip of the locking screw faces one side of the transverse guide rail (27).

2. A self-centering device for a vertical lathe worktable according to claim 1, characterized in that: Four guide rail seats (4) in a circular array are fixedly arranged on the upper end surface of the workbench (1), and the length direction of the guide rail seats (4) is arranged along the radial direction of the workbench (1); each guide rail seat (4) includes two symmetrically arranged radial guide rails, and the length direction of the radial guide rails is parallel to the length direction of the guide rail seat (4); and a motor seat (5) is fixedly arranged at one end of each guide rail seat (4) away from the axis of the workbench (1).

3. A self-centering device for a vertical lathe worktable according to claim 2, characterized in that: The inner clamping assembly further comprises an inner sliding seat (6), an inner clamping screw (7), and an inner clamping motor (8); the same inner sliding seat (6) is slidably arranged on the two radial guide rails of each guide rail seat (4), and an inner clamping claw (2) is fixedly arranged on the upper end surface of each inner sliding seat (6); an inner clamping screw (7) is rotatably arranged inside each guide rail seat (4), and the inner clamping screw (7) is screwed to the inner sliding seat (6); an inner clamping motor (8) is fixedly arranged on each motor seat (5), and the output shaft of the inner clamping motor (8) is connected to the outer end of the corresponding inner clamping screw (7).

4. A self-centering device for a vertical lathe worktable according to claim 2, characterized in that: The outer clamping assembly further comprises an outer sliding seat (9), an outer clamping screw (10), and an outer clamping motor (11); the same outer sliding seat (9) is slidably arranged on the two radial guide rails of each guide rail seat (4), and the outer sliding seat (9) is located on the side of the inner sliding seat (6) away from the axis of the workbench (1); an outer clamping claw (3) is fixedly arranged on the upper end surface of each outer sliding seat (9); an outer clamping screw (10) is rotatably arranged on the inner side of each guide rail seat (4), and the outer clamping screw (10) is screwed to the outer sliding seat (9); an outer clamping motor (11) is fixedly arranged on each motor seat (5), and the output shaft of the outer clamping motor (11) is connected to the outer end of the corresponding outer clamping screw (10).

5. The self-centering device for a vertical lathe worktable according to claim 1, characterized in that: The lifting assembly comprises a lifting motor (16), a synchronous belt transmission mechanism (18), and a transmission shaft (17); a lifting motor (16) is fixedly arranged on the upper end surface of the measuring frame (12); a transmission shaft (17) is also rotatably arranged on the upper end surface of the measuring frame (12); the transmission shaft (17) is arranged along the radial direction of the workbench (1); and the output shaft of the lifting motor (16) and the transmission shaft (17) are transmission-connected via the synchronous belt transmission mechanism (18).

6. A self-centering device for a vertical lathe worktable according to claim 5, characterized in that: The lifting assembly further comprises a lifting guide rail (19), a lifting slider (20), a lifting synchronous belt (23), a driving pulley (21), and a driven pulley (22); four vertical lifting guide rails (19) are fixedly arranged on a side of the measuring frame (12) close to the bracket (14); two lifting sliders (20) are fixedly arranged on a side of the bracket (14) close to the measuring bracket (14); two lifting sliders (20) are fixedly arranged on a side of the driving frame (15) close to the measuring frame (12); the two lifting sliders (20) on the bracket (14) are respectively slidably engaged with the outer sides of the two lifting guide rails (19) on a side close to the workbench (1); and the two lifting sliders (20) on the driving frame (15) are fixedly arranged on a side close to the measuring frame (12). 0) are respectively slidably connected to the outer sides of two lifting guide rails (19) on the side away from the workbench (1); four driving pulleys (21) are fixedly sleeved on the transmission shaft (17); four driven pulleys (22) are rotatably arranged at the lower end of the measuring frame (12) on the side close to the bracket (14), and the driving pulleys (21) and the driven pulleys (22) correspond to each other one by one up and down; four lifting synchronous belts (23) are respectively sleeved on the outer sides of the four sets of driving pulleys (21) and the driven pulleys (22), wherein the bracket (14) is fixedly arranged on the two lifting synchronous belts (23) on the side close to the workbench (1), and the driving frame (15) is fixedly arranged on the two lifting synchronous belts (23) on the side away from the workbench (1).

7. The self-centering device for a vertical lathe worktable according to claim 1, characterized in that: A grating ruler (36) is fixedly arranged on the side of the sliding frame (24) away from the measuring frame (12), and the length direction of the grating ruler (36) is consistent with that of the sliding frame (24); a grating ruler reader (37) is fixedly arranged at the lower end of the side of the driving frame (15) close to the workbench (1), and the grating ruler reader (37) corresponds to the grating ruler (36) in the upper and lower directions.

Images